Effects of Chlorella vulgaris at Different Growth Stages and Concentrations on the Growth of Pelargonium × hortorum

Alejandro Rápalo-Cruz, Cintia Gomez-Serrano, Cynthia Victoria Gonzalez-Lopez, Mohammad Bagher Hassanpouraghdam, Asghar Ebrahimzadeh and Silvia Jimenez-Becker ()
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Alejandro Rápalo-Cruz: Department of Agronomy, Higher Engineering School, Agrifood Campus of International Excellence (CeiA3), Ctra. Sacramento s/n., 04120 Almería, Spain
Cintia Gomez-Serrano: Department of Chemical Engineering, Higher Engineering School, CIESOL, Agrifood Campus of International Excellence (CeiA3), Ctra. Sacramento s/n., 04120 Almería, Spain
Cynthia Victoria Gonzalez-Lopez: Department of Chemical Engineering, Higher Engineering School, CIESOL, Agrifood Campus of International Excellence (CeiA3), Ctra. Sacramento s/n., 04120 Almería, Spain
Mohammad Bagher Hassanpouraghdam: Department of Horticultural Sciences, Faculty of Agriculture, University of Maragheh, Maragheh 55181-83111, Iran
Asghar Ebrahimzadeh: Department of Horticultural Sciences, Faculty of Agriculture, University of Maragheh, Maragheh 55181-83111, Iran
Silvia Jimenez-Becker: Department of Agronomy, Higher Engineering School, Agrifood Campus of International Excellence (CeiA3), Ctra. Sacramento s/n., 04120 Almería, Spain

Agriculture, 2025, vol. 15, issue 4, 1-15

Abstract: Microalgae are gaining attention as a sustainable and efficient alternative in modern agriculture due to their biostimulant and biofertilizer effects, which promote plant growth and improve plant resistance to abiotic stress factors. Their effectiveness vary according to factors such as concentration and growth stage. This study evaluates the potential of Chlorella vulgaris ( C. vulgaris ) to stimulate various plant parameters, including growth, biomass, leaf development, and flowering. The trial was carried out in a greenhouse, using Pelargonium × hortorum plants grown on coconut fiber substrate. A nested factorial design was applied, with treatments including a control (irrigation water only) and four experimental groups with microalgae applied at concentrations of 0.1 g L −1 and 1 g L −1 , harvested in the stationary or exponential growth phases. The experiment was repeated in autumn and spring to assess seasonal effects. Variables such as plant height, diameter, number of leaves and flowers, as well as the fresh and dry weight of the different plant organs were measured. In addition, leaf area was determined. The results indicate that higher application rates (1 g L −1 ) increased nitrate, phosphate, and potassium levels, highlighting the role of C. vulgaris in improving plant nutrition. The application of C. vulgaris at 1 g L −1 , especially in the stationary growth phase, promoted growth and advanced flowering in Pelargonium × hortorum . In conclusion, C. vulgaris shows significant potential as an agricultural biofertilizer, promoting the growth of Pelargonium × hortorum .

Keywords: microalgae; biostimulant; biofertilizer; irrigation; ornamental plants (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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